"(那是)必须的! ((Nà shì) bìxū de!)" is now a very popular word in the daily life of Chinese that is used to show confirmation. "那 (nà)" means that; "是 (shì)" means is; "必须 (bìxū)" means must; "的 (de)" is a particle. It gained popularity from a catch phrase in Northeast China and was first known in the form of short sketch dialogues. It conveys the same meaning as the English "That's a must!"

Since the phrase carries a humorous tone when used, it's gradually gaining popularity in common speech and online communications. The short form "必须的! (Bìxū de!)" is already something of a catch phrase amongst the young, especially in Northeast China. The lighthearted tone it carries and its ability to work as a good icebreaker has been key to its spread all over China, especially between friends, students and acquaintances.

"(那是)必须的! ((Nà shì) bìxū de!)" is an useful and comical language tool to express agreements and sometimes even compliments. It also plays its role in artistic works, such as the famous Chinese TV series 《奋斗》(Fèndòu) Struggle, movies and so on.